Breeding pair abundances derived from nestbox studies of the Netherlands Institute of Ecology (NIOO-KNAW)

This dataset contains the annual number of breeding pairs of eight hole-nesting bird species across seven long-term study sites in the Netherlands. Data were collected by the Netherlands Institute of Ecology (NIOO-KNAW) and hosted at SPI-Birds Network and Database, an intiative that connects researchers working on populations of individually-marked breeding birds, harmonises their data, and facilitates collaboration, synthesis, and data reuse.